fix #442

Author: eblondel

NEWS.md

@@ -7,6 +7,7 @@
 * [#437](https://github.com/r-geoflow/geoflow/issues/437) Metadata privileges not assigned to 'all' when no restriction
 * [#439](https://github.com/r-geoflow/geoflow/issues/439) Priv configuration setting broken for ISO 19110 (wrong md identifier)
 * [#440](https://github.com/r-geoflow/geoflow/issues/440) Metadata thumbnail publication fails if description includes special characters
+* [#442](https://github.com/r-geoflow/geoflow/issues/442) Entity toDataFrame fails with Null provenance
 
 **New features**
 

R/geoflow_entity.R

@@ -2440,10 +2440,10 @@ geoflow_entity <- R6Class("geoflow_entity",
         Provenance = {
           outprov <- NA
           if(!is.null(self$provenance)){
-            if(is.na(self$provenance$statement)){
+            if(is.null(self$provenance$statement)){
               outprov <- ""
             }else{
-              outprov <- paste0("statement:", paste0("\"",self$provenance$statement,"\""))
+              outprov <- if(is.na(self$provenance$statement)) "" else paste0("statement:", paste0("\"",self$provenance$statement,"\""))
               if(length(self$provenance$processes)>0){
                 outprov <- paste0(outprov, line_separator)
                 processes_str <- paste0(sapply(self$provenance$processes, function(process){